I get a super fast 1.5Mbs per second (yes, I know you will all be queuing to get that level of performance)
In the last two days this has dropped to 1.0 Mbs, this is ready from the router table showing its status with the exchange.
However the upstream has risen from 400kbs to 600kbs.
The overall drop is over a third of my total speed, I have not reported this to Sky yet.
The speed is the same if I connect direct to the Master with the faceplate removed (eliminating the house wiring)